package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService  workspaceService;

    //  营业额统计
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {

        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while((! begin.equals(end)) && begin.isBefore(end)){
            //日期计算，计算指定日期的后一天的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();
        for(LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.getTurnoverByDate(map);

            turnoverList.add(turnover == null ? 0.0 : turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {

        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while((! begin.equals(end)) && begin.isBefore(end)){
            //日期计算，计算指定日期的后一天的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天新增用户数量
        List<Integer> newUserList = new ArrayList<>();
        //存放总用户数量
        List<Integer> totalUserList = new ArrayList<>();

        for(LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end", endTime);
            Integer totalUser = userMapper.getCountByDate(map);
            totalUserList.add(totalUser);

            map.put("begin", beginTime);
            Integer newUser = userMapper.getCountByDate(map);
            newUserList.add(newUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {

        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while((! begin.equals(end)) && begin.isBefore(end)){
            //日期计算，计算指定日期的后一天的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();

    for(LocalDate date : dateList){
        LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

        //统计每日总订单数量
        Integer orderCount = getOrderCount(beginTime, endTime,null);
        orderCountList.add(orderCount);
        //统计每日有效订单数量
        Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
        validOrderCountList.add(validOrderCount);
    }

        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {

        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> name = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(name, ",");
        List<Integer> number = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(number, ",");

        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    @Override
    public void exportBusinessData(HttpServletResponse response) {

        //查询数据库，获取营业数据--查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().plusDays(-30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getResourceAsStream("/template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excal文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //获取表格文件的sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);
            //获得第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            //获得第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for(int i = 0; i < 30; i++){
                //查询某一天的营业数据
                LocalDate date = dateBegin.plusDays(i);
                BusinessDataVO data = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(data.getTurnover());
                row.getCell(3).setCellValue(data.getValidOrderCount());
                row.getCell(4).setCellValue(data.getOrderCompletionRate());
                row.getCell(5).setCellValue(data.getUnitPrice());
                row.getCell(6).setCellValue(data.getNewUsers());
            }

            //通过输出流将Excal文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status",status);

        return orderMapper.getOrderCount(map);
    }
}
